import turtle
turtle.screensize(None,None, 'blue')
turtle.fillcolor('yellow')#
turtle.shape('turtle')
turtle.begin_fill()

turtle.forward(100)
turtle.left(144)
turtle.forward(100)
turtle.left(144)
turtle.forward(100)
turtle.left(144)
turtle.forward(100)
turtle.left(144)
turtle.forward(100)
turtle.left(144)
turtle.end_fill()
turtle.done()
